Literature
- Aarefjord H., Bjørge A., Kinze C.C. and Lindstedt I. 1995. Diet of the Harbour Porpoise, Phocoena phocoena, in Scandinavian waters. Rep. Int. Whal. Commn (Special issue 16): 211-222.
- Bjørge A., Aarefjord H., Kaarstad S., Kleivane L. and Øien N. 1991. Harbour Porpoises Phocoena phocoena in Norwegian waters. ICES C.M.
- Brooke M. 1990. The Manx Shearwater. T. and A.D. Poyser, Academic Press Limited, London, 246pp.